police identified the man as joshua perez of union city who stayed at that home from time to time. they said there was no obvious sign of trauma. >> it was a prank of some sort or whether the person injured was some where else and placed in the can we don't know yet. obviously it's an unusual situation so we're treating it as it was a serious crime. >> reporter: perez' family is devastated. they say he was a kindhearted person who loved everybody. an autopsy will likely be performed tomorrow to try to determine his cause of death. >>> menlo park police say they have arrested four people and at least two are known gang members. the arrest came after reports of gunfire before dawn on mad era street. neighbors pointed out the house involved to ktvu. police said they seized two assault rifles, a semi automatic handgun and marijuana. and neighbors say they are uneasy. >> it's very, very quiet. i don't understand how the violence is coming over here and i mean, it just i think it needs to stop. >> reporter: 10 days ago police say four people were injured in another shooting involving tha